How hard is it to walk in a straight line? Very hard, actually - according to a new study by psychologist Jan Souman of the Max Planck Institute for Biological Cybernetics, people who are lost in the woods or desert actually do walk in circles:

At first, Souman wasn't sure if that common sensation was actually true. When lost, he suspected, people might veer to the left or right. But he didn't expect them to actually walk in true circles.

To find out, he instructed nine people to walk as straight as possible in one direction for several hours.

Six walkers forged through a flat, forested region of Germany. Three trekked through the Sahara desert in southern Tunisia. (A sandstorm stopped further testing in the desert). All walkers wore GPS receivers so that the researchers could analyze their routes.

The results, published today in the journal Current Biology, showed that no matter how hard people tried to walk in a straight line, they often ended up going in circles without ever realizing that they were crossing their own paths.

the reason why scientific studies like this are performed is to clarify the reasons behind such phenomena. Otherwise we could equally attribute it to a longer leg, the position of the sun, or the invisible sky man.